You already have it, the D|S program installer includes the basic dynamics plugin. If you have the latest program version, you have the latest plugin version.

Your actual problem might be the same as what I think I'm getting now that I'm making more effort to get used to 4.5 — some items, in particular some dynamic clothes, either didn't save their /data/ files properly in D|S3, or D|S 4.5 is misreading the data folder location from the old scene files. I think I'll have to file a support ticket for this, it's a bit of a head-scratcher.

Hmm, odd. I'm on 4.5.1.6 Pro 64-bit as well, and I have the full Control plugin also named dzoptitexclothcontrol.dll and it's listed as working properly. I'd reccommend opening a support ticket to get to the bottom of your problem. It still sounds a bit like my "misplaced /data/ files" glitch, but not quite close enough to be sure we are having the same problem.

@Marchosius: go in the DS4/plugins subfolder and rename dzoptitexclothbasic.dll.basic to dzoptitexclothbasic.dll.@SpottedKitty: hmm, not sure, but some clothes have been remade around the DS 3.1.x.y days, it's perhaps worth a shot to try and redownload them to see if they were indeed updated.